/**
 * REOT - Main Stylesheet
 * 主样式文件
 */

/* ========================================
   CSS Variables / 变量定义
   ======================================== */
:root {
    /* Colors */
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-secondary: #6366f1;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Layout */
    --header-height: 60px;
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 60px;
    --footer-height: 50px;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    /* Font - Inter for UI, JetBrains Mono for code */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;

    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-tooltip: 400;
}

/* ========================================
   Reset / 重置样式
   ======================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.6;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
}

img {
    max-width: 100%;
    height: auto;
}

ul,
ol {
    list-style: none;
}

/* ========================================
   Layout / 布局
   ======================================== */
.app-container {
    display: grid;
    grid-template-areas:
        "header header"
        "sidebar main"
        "sidebar footer";
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: var(--header-height) 1fr var(--footer-height);
    min-height: 100vh;
}

/* Header */
.app-header {
    grid-area: header;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-center {
    flex: 1;
    max-width: 500px;
    margin: 0 var(--spacing-lg);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.logo:hover {
    color: var(--color-primary);
}

.logo-image {
    width: 32px;
    height: 32px;
}

/* Menu Toggle */
.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-primary);
}

.menu-toggle:hover {
    background-color: var(--bg-hover);
}

.hamburger {
    display: block;
    width: 20px;
    height: 2px;
    background-color: currentColor;
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: currentColor;
    left: 0;
}

.hamburger::before {
    top: -6px;
}

.hamburger::after {
    top: 6px;
}

/* Search Box */
.search-box {
    display: flex;
    align-items: center;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: var(--spacing-xs) var(--spacing-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-input {
    flex: 1;
    border: none;
    background: none;
    padding: var(--spacing-sm) 0;
    color: var(--text-primary);
    outline: none;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    padding: var(--spacing-xs);
}

.search-btn:hover {
    color: var(--color-primary);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--bg-hover);
}

/* Language Selector */
.language-select {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
}

.language-select:focus {
    border-color: var(--color-primary);
}

/* GitHub Link */
.github-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: background-color var(--transition-fast);
}

.github-link:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

/* Sidebar */
.app-sidebar {
    grid-area: sidebar;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    overflow-x: hidden;
    position: sticky;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
}

.sidebar-nav {
    padding: var(--spacing-md);
}

/* Navigation Category */
.nav-category {
    margin-bottom: var(--spacing-sm);
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    user-select: none;
    transition: background-color var(--transition-fast);
}

.category-header:hover {
    background-color: var(--bg-hover);
}

.category-icon {
    font-size: var(--font-size-lg);
}

.category-title {
    flex: 1;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.category-arrow {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.nav-category.collapsed .category-arrow {
    transform: rotate(-90deg);
}

.nav-category.collapsed .category-tools {
    display: none;
}

/* Tool List */
.category-tools {
    margin-top: var(--spacing-xs);
    padding-left: var(--spacing-xl);
}

.tool-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.tool-link:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.tool-link.active {
    background-color: var(--color-primary);
    color: white;
}

/* Main Content */
.app-main {
    grid-area: main;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

/* Footer */
.app-footer {
    grid-area: footer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.footer-content a {
    color: var(--text-secondary);
}

.footer-content a:hover {
    color: var(--color-primary);
}

/* ========================================
   Home Page / 首页
   ======================================== */
.home-content {
    max-width: 1200px;
    margin: 0 auto;
}

/* Hero Section - Modern Developer Style */
.hero {
    position: relative;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg,
        rgba(59, 130, 246, 0.05) 0%,
        rgba(99, 102, 241, 0.08) 50%,
        rgba(139, 92, 246, 0.05) 100%);
}

.hero-glow {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle,
        rgba(59, 130, 246, 0.15) 0%,
        rgba(99, 102, 241, 0.08) 40%,
        transparent 70%);
    pointer-events: none;
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { opacity: 0.5; transform: translateX(-50%) scale(1); }
    100% { opacity: 0.8; transform: translateX(-50%) scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.hero-badge svg {
    flex-shrink: 0;
}

.hero-title {
    font-size: clamp(1.75rem, 5vw, 2.75rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    text-decoration: none;
    cursor: pointer;
}

.hero-btn--primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.hero-btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
    color: white;
}

.hero-btn--secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.hero-btn--secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-color-dark);
    color: var(--text-primary);
}

/* Compact Features Bar */
.features-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.feature-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.feature-badge:hover {
    border-color: var(--color-primary);
    color: var(--text-primary);
}

.feature-badge svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

.feature-badge span:first-of-type {
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--text-primary);
}

.feature-badge--highlight {
    background: rgba(59, 130, 246, 0.05);
    border-color: rgba(59, 130, 246, 0.2);
}

.feature-badge--highlight span {
    font-weight: 500;
    font-family: var(--font-family);
    color: var(--text-secondary);
}

.feature-badge--highlight:hover {
    background: rgba(59, 130, 246, 0.1);
}

/* GitHub Stats Badges */
.github-stats {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.github-stat-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.github-stat-badge:hover {
    color: var(--text-primary);
    border-color: var(--color-primary);
    background: rgba(59, 130, 246, 0.05);
}

.github-stat-badge svg {
    flex-shrink: 0;
    opacity: 0.7;
}

.github-stat-badge:hover svg {
    opacity: 1;
}

.github-stat-count {
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--text-primary);
    padding: 2px 6px;
    background: var(--bg-hover);
    border-radius: var(--radius-sm);
    min-width: 24px;
    text-align: center;
}

/* Tools Section */
.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.section-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
}

/* Section Headers */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.section-header .section-title {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.section-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-action-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.section-action-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: rgba(59, 130, 246, 0.05);
}

.section-action-btn.active {
    color: white;
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.section-hint {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(59, 130, 246, 0.05);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-primary);
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    text-align: center;
}

.empty-state svg {
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state p {
    font-size: var(--font-size-md);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.empty-state span {
    font-size: var(--font-size-sm);
}

.quick-access,
.all-tools,
.category-tools-section {
    margin-bottom: var(--spacing-xl);
}

/* Category Cards Grid */
.category-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.category-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.category-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.1);
}

.category-card__header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(99, 102, 241, 0.08) 100%);
    border-bottom: 1px solid var(--border-color);
}

.category-card__icon {
    font-size: var(--font-size-xl);
}

.category-card__name {
    flex: 1;
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
}

.category-card__count {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--text-muted);
    padding: 2px 8px;
    background: var(--bg-hover);
    border-radius: var(--radius-full);
}

.category-card__tools {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
}

.category-tool-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    background: var(--bg-hover);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.category-tool-link:hover {
    color: var(--color-primary);
    background: rgba(59, 130, 246, 0.1);
}

.category-tool-icon {
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.category-tool-name {
    line-height: 1.3;
}

.category-tool-more {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
    cursor: pointer;
}

.category-tool-more:hover {
    text-decoration: underline;
}

/* Collapsible Section */
.section-header--collapsible {
    cursor: pointer;
    user-select: none;
}

.section-header--collapsible:hover {
    background: var(--bg-hover);
    margin-left: calc(-1 * var(--spacing-md));
    margin-right: calc(-1 * var(--spacing-md));
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
    border-radius: var(--radius-md);
}

.collapse-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
}

.collapse-toggle:hover {
    color: var(--text-primary);
}

.tool-count {
    font-weight: 500;
}

.collapse-icon {
    transition: transform var(--transition-fast);
}

.all-tools.collapsed .collapse-icon,
#all-tools-section.collapsed .collapse-icon {
    transform: rotate(-90deg);
}

.tool-grid.collapsible {
    transition: all var(--transition-normal);
    overflow: hidden;
}

.tool-grid.collapsible.collapsed {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding: 0;
}

/* Tool Card Star */
.tool-card--editable {
    position: relative;
}

.tool-card__star {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    opacity: 0.8;
}

.tool-card__star:hover {
    opacity: 1;
    border-color: var(--color-warning);
    color: var(--color-warning);
    transform: scale(1.1);
}

.tool-card__star.starred {
    color: var(--color-warning);
    border-color: var(--color-warning);
    background: rgba(245, 158, 11, 0.1);
    opacity: 1;
}

.tool-card--editable:hover .tool-card__star {
    opacity: 1;
}

/* Search Result Star */
.search-result-item {
    position: relative;
    padding-right: 50px;
}

.search-result-item__star {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.search-result-item__star:hover {
    color: var(--color-warning);
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--color-warning);
}

.search-result-item__star.starred {
    color: var(--color-warning);
}

/* Tool Page Quick Access Button */
.tool-header__actions {
    margin-top: var(--spacing-sm);
}

.tool-page-quick-access {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tool-page-quick-access:hover {
    color: var(--color-warning);
    border-color: var(--color-warning);
    background: rgba(245, 158, 11, 0.05);
}

.tool-page-quick-access.starred {
    color: var(--color-warning);
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--color-warning);
}

.tool-page-quick-access.starred:hover {
    background: rgba(245, 158, 11, 0.15);
}

/* Quick Access Toast */
.quick-access-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    z-index: 10000;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.quick-access-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.quick-access-toast.hide {
    transform: translateX(-50%) translateY(100px);
    opacity: 0;
}

.quick-access-toast svg {
    color: var(--color-warning);
    flex-shrink: 0;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

.tool-card {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    overflow: hidden;
}

.tool-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg,
        rgba(59, 130, 246, 0.03) 0%,
        rgba(99, 102, 241, 0.05) 100%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.tool-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.12);
}

.tool-card:hover::after {
    opacity: 1;
}

.tool-card__icon {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    font-size: 24px;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(99, 102, 241, 0.12) 100%);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.tool-card:hover .tool-card__icon {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    transform: scale(1.08);
}

.tool-card__name {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    line-height: 1.4;
}

.tool-card__desc {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-align: center;
    margin-top: var(--spacing-xs);
    line-height: 1.4;
}

/* ========================================
   Tool Page / 工具页面
   ======================================== */
.tool-container {
    max-width: 1000px;
    margin: 0 auto;
}

.tool-header {
    margin-bottom: var(--spacing-xl);
}

.tool-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.tool-header p {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
}

.tool-main {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Input/Output Sections */
.input-section,
.output-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.input-section label,
.output-section label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.input-section textarea,
.output-section textarea {
    width: 100%;
    min-height: 150px;
    padding: var(--spacing-md);
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    resize: vertical;
    outline: none;
    transition: border-color var(--transition-fast);
}

.input-section textarea:focus,
.output-section textarea:focus {
    border-color: var(--color-primary);
}

/* Action Section */
.action-section {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.action-section button {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.action-section button:first-child {
    background-color: var(--color-primary);
    color: white;
}

.action-section button:first-child:hover {
    background-color: var(--color-primary-hover);
}

.action-section button:not(:first-child) {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.action-section button:not(:first-child):hover {
    background-color: var(--bg-hover);
}

/* Options Section */
.options-section {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.option-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.option-group label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.option-group select,
.option-group input[type="text"],
.option-group input[type="number"] {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    outline: none;
}

/* ========================================
   Search Results / 搜索结果
   ======================================== */
.search-results-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: calc(var(--header-height) + var(--spacing-lg));
    z-index: var(--z-modal);
}

.search-results-container {
    width: 90%;
    max-width: 600px;
    max-height: 60vh;
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.search-results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.search-results-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.close-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--text-muted);
    border-radius: var(--radius-md);
}

.close-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.search-results-list {
    overflow-y: auto;
    max-height: calc(60vh - 60px);
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.search-result-item:hover {
    background-color: var(--bg-hover);
}

.search-result-item__icon {
    font-size: var(--font-size-xl);
}

.search-result-item__info {
    flex: 1;
}

.search-result-item__name {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
}

.search-result-item__category {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* ========================================
   Utilities / 工具类
   ======================================== */
.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ========================================
   Responsive / 响应式
   ======================================== */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-areas:
            "header"
            "main"
            "footer";
    }

    .menu-toggle {
        display: flex;
    }

    .app-sidebar {
        position: fixed;
        top: var(--header-height);
        left: 0;
        bottom: 0;
        width: var(--sidebar-width);
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        z-index: var(--z-sticky);
    }

    .app-sidebar.open {
        transform: translateX(0);
    }

    .header-center {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
        --spacing-lg: 16px;
        --spacing-xl: 24px;
    }

    .header-right {
        gap: var(--spacing-sm);
    }

    .language-select {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-sm);
    }

    .hero {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .hero-glow {
        width: 300px;
        height: 300px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-btn {
        justify-content: center;
    }

    .github-stats {
        gap: var(--spacing-xs);
    }

    .github-stat-badge {
        padding: 4px 10px;
        font-size: 11px;
    }

    .github-stat-badge span:not(.github-stat-count) {
        display: none;
    }

    .features-bar {
        gap: var(--spacing-xs);
    }

    .feature-badge {
        padding: 4px 8px;
        font-size: 11px;
    }

    .tool-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .section-title::before {
        display: none;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .section-actions {
        width: 100%;
    }

    .section-action-btn {
        flex: 1;
        justify-content: center;
    }

    .category-cards-grid {
        grid-template-columns: 1fr;
    }

    .category-tool-link {
        max-width: none;
        flex: 1 1 calc(50% - var(--spacing-xs));
    }
}

@media (max-width: 480px) {
    .logo-text {
        display: none;
    }

    .tool-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .tool-card {
        padding: var(--spacing-md);
    }

    .tool-card__icon {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }

    .action-section {
        flex-direction: column;
    }

    .action-section button {
        width: 100%;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .hero-glow {
        animation: none;
    }

    .tool-card,
    .hero-btn,
    .feature-badge {
        transition: none;
    }

    .tool-card:hover {
        transform: none;
    }
}